The effects of canal preparation and filling on the incidence of dentinal defects

By Shemesh H1, Bier CA, Wu MK, Tanomaru-Filho M, Wesselink PR

Date: 01/2009
Journal: IEJ

Purpose:

Examine the effects of canal preparation and filling on the incidence of dentinal defects

Materials/Methods:

N = 80

Extracted mandibular premolars were divided equally in four groups. Group 1 was left unprepared. All other root canals were prepared using Gates Glidden drills and System GT files up to size-40, 0.06 taper at the working length. Group 2 was not filled while the canals of the other groups were filled with gutta-percha and AH26, either with a master cone and passive insertion of secondary gutta percha points (group 3) or lateral compaction (group 4). Roots were then sectioned horizontally 3, 6, and 9 mm from the apex and observed under a microscope. The presence of dentinal defects (fractures, craze lines or incomplete cracks) was noted and the differences between the groups were analyzed with the Fisher’s exact test.

Results:

Canal preparation alone created significantly more defects than unprepared canals (P < 0.05). The total number of defects after lateral compaction was significantly larger than after non-compaction canal filling.

Clinical Significance:

Root canal preparation and filling of extracted teeth created dentine defects such as fractures, craze lines and incomplete cracks